Hime-sama Love Life! / Princesses' Love Life!

Studio PoRo has announced an anime hentai adaptation of the visual novel "Hime-sama Love Life!" by Studio Princess Sugar, released in 2015. The hentai is scheduled for the end of May, and the exact number of episodes is still unknown. 

Due to his father's new job, Yahiro-kun was forced to move with his little sister Io-chan to a new apartment. They quickly adapted to the new home and began to get used to independent life. However, shortly after enrolling in the academy, Yahiro noticed a strange large truck near his house. Io-chan's belongings had already arrived, and he became curious about what was going on. Going up the stairs and fearing that there might be a burglar in the unlocked room, Yahiro slowly began to open the door. There he met a half-naked girl, dressed only in underwear, vigorously pushing a heavy piano. Seeing our hero, the girl screamed and made him leave. A little later, she dressed in a beautiful dress and came out to greet him. Her name was Ruria Fondina, and she was a princess of one of the island nations. The girl had arrived to live together with our hero. Soon, other "princesses" began to appear at Yahiro's door... 

The plot for a hentai harem is quite ordinary, but there may be some inaccuracies in the description itself, since this work has not yet been released. If you have a more relevant and correct description, leave it in the comments and it will definitely be added.